ポート番号を変更する
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\TerminalServer\WinStations\RDP-Tcp
エントリ名：PortNumber


リモートデスクトップのログを取る
Remote Desktop Tips for the SOHO User
"An Audit Policy may be configured using the Group Policy editor to track logon success and failures. From the Start | Run command window type gpedit.msc. Navigate to Local Computer Policy | Computer Configuration | Windows Settings | Security Settings | Local Policies | Audit Policy | Audit logon events. Highlight and right-click and select properties. Configure as desired."